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HVAC PRODUCTS

UNITHEATERS

TUBULAR UNIT HEATERS82%+ EFFICIENT

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CONTENTSTubular Gas-Fired Unit Heaters PageModel GG, Low-Profile Garage Certified 4

Model TF, Commercial 5

Model GF, Shield™, Stainless Steel 6

Propeller Type Gas-Fired Unit HeatersModel QVEF, Power Vent 7Model QVSF, Separated Combustion 8

Blower Type Gas-Fired Unit HeatersModel QVEB, Power Vent 9

Model QVSB, Separated Combustion 10

Gas-Fired Indoor Duct FurnacesModels QVED/QVES, Power Vent 11

Model QVSD, Separated Combustion 12

Steam and Hot Water Unit HeatersModel HS, Header Type/Serpentine Type 14

Model VS, Vertical Unit 15


Efficient Heating Solutions for Large, Open Spaces Sterling Gas-Fired Unit Heaters provide efficient heating

solutions for a variety of residential and commercial

applications. Several styles are available,

including Tubular, Propeller-Type, Blower

Type, and Indoor Duct Furnaces with

capacities ranging from 30 to

400 MBH.

Our complete line ofheaters allows customers toorder the exact capacity modelthey need without energy-wastingoversizing. Applications include residentialand commercial garages, workshops,warehouses, factories, shipping areas, and publicbuildings. The units provide efficiencies of up to 83%.

Heat Exchanger TechnologyUnlike other heat exchangers that feature lightweight construction,Sterling’s minimum metal standard (aluminized or stainless steel) is heavy-duty 20 gauge. Our heat exchangers and reliable, energy-saving ignition system technology allow heated air to be evenlydistributed to the conditioned space. Exceptional balance of motorand blower components ensures quiet operation.

Ease of Service and MaintenanceAll Sterling unit heaters are designed for ease of installation, service

and maintenance. All major components are easily accessible to save

time on inspection and service calls. For tubular unit heaters, ignition

and control fans are located in one centrally located control panel.

On “QV” models, burners are individually removable for inspection

and servicing. Quality components throughout ensure long service life.

Warranty and Factory AssuranceAll Sterling Unit Heaters are covered by a 10-Year Warranty (unless

otherwise indicated) on complete heat exchangers, draft hood

assemblies and burners. Each unit is factory test-fired to ensure

proper operation when installed.


Model GG LOW-PROFILE, RESIDENTIAL GARAGE CERTIFIED

4

Tubular GAS-FIRED UNIT HEATERS

Standard Features:• 20 gauge tubular heat exchangers• 7 sizes ranging from 30 to 120 MBH• Single orifice burner• Direct spark ignition system• 20 gauge jacket panels w/baked enamel finish• Easy access control panel• Certified for category I and III venting• 82%+ thermal efficiency• ETL certified• OSHA type fan guard• Field convertible to separated combustion w/

concentric kit addition

The Garage Guy heater is a tubular design propellertype unit heater that utilizes a single orifice burner.It’s low profile design and sizes ranging from 30-120MBH make it ideal for all applications.


Standard Features:• 20 gauge tubular heat exchangers• 7 sizes ranging from 150 to 400 MBH• Inshot type burner• Direct spark ignition system• 20 gauge jacket panels w/baked enamel finish• Power vented• Easy access control panel• Certified for category I and III venting• Terminal strip low voltage wiring• 83% thermal efficiency• ETL certified

The “TF” is a propeller type unit heater thatcombines the latest tubular heat exchanger andinshot burner technology with the quality andreliability you have come to know with Sterling.Available in sizes 150 - 400.

5

Model TFLATEST TUBULAR HEATEXCHANGER TECHNOLOGY


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Tubular GAS-FIRED UNIT HEATERS

STAINLESS STEEL CONSTRUCTIONRESISTS MOISTURE AND RUST FORCOMMERCIAL GREENHOUSEAPPLICATIONSThe Shield™ gas fired tubular unit heaters are built betterby design. Stainless steel construction provides maximumprotection against moisture and rust. They are the idealheating solution for both glass and poly greenhouses.Durable tubular heat exchanger provides maximum anduniform heat transfer and significantly longer service life.Available in sizes 150, 250, and 400 MBH, Shield™ unitheaters are backed by a full 5-year warranty on the heat exchanger, flue collector and burners.

Standard Features:• Stainless steel construction for maximum corrosion resistance• 150, 250 and 400 MBH• Individually adjustable and locking louvers• Power vented• Inshot burners• Easy access control panel• Single stage combination gas valve• 5-year warranty

Model GF


7

Model QVEFPOWER VENT INSTALLEDThe Sterling model “QVEF” high efficiency unit heaterachieves 80% thermal efficiencies and annual fuel savingsof up to 25% over conventional natural vented unit heaters.The “QVEF” features a standard factory installed power vent and sealed flue collector that controls combustionand excess air during ‘on’ cycles.

Standard Features:• CSA certified for 80% efficiencies• 10 sizes ranging from 100 to 400 MBH• Aluminized steel heat exchanger - 20 gauge• Optional 409 and 321 stainless steel heat exchangers• Single stage gas valve • Optional 2 stage and modulating gas valves• Spark Ignition • Available in Natural or LP gas• Easy burner access with individual removable burners• Two point suspension

Propeller Type GAS-FIRED UNIT HEATERS


8

Propeller Type GAS-FIRED UNIT HEATERS

Model QVSFSEPARATED COMBUSTION DESIGNFOR MILDLY HOSTILE ENVIRONMENTSThe Sterling model “QVSF”separated combustion unit heateris designed to be installed in mildly hostile environmentswhere dusty, dirty, and mildly corrosive conditions exist, or high humidity or slightly negative pressures prevail. Theburners, pilot and flue system are enclosed within the unit.The entire combustion process is literally unaffected by theatmosphere in the space where the unit is located. Units areavailable from 100-400 MBH and carry a one-year warranty.

Standard Features:• CSA certified for 80% efficiencies• 10 sizes ranging from 100 to 400 MBH• Aluminized steel heat exchanger - 20 gauge• Optional 409 and 321 stainless steel heat exchangers• Single stage gas valve • Optional 2 stage and modulating gas valves• Spark Ignition• Available in Natural or LP gas• Easy burner access with individual removable burners• Factory fire tested


9

Blower Type GAS-FIRED UNIT HEATERS

Model QVEBINSTALLED POWER VENTThe model “QVEB” high efficiency unit heater achieves annualfuel savings of up to 25% over conventional natural ventedunit heaters. The “QVEB” features a factory installed powervent and sealed flue collector that controls combustion andexcess air during on cycles.

Standard Features:• CSA certified for 80% efficiencies• 10 sizes ranging from 100 to 400 MBH• Aluminized steel heat exchanger - 20 gauge• Optional 409 and 321 stainless steel heat exchangers• Single stage gas valve • Optional 2 stage and modulating gas valves• Spark ignition• Available in Natural or LP gas• Easy burner access with individual removable burners• Optional duct flange connection in lieu of discharge louvers


10

Blower Type GAS-FIRED UNIT HEATERS

Model QVSBSEPARATED COMBUSTION DESIGN FORMILDLY HOSTILE ENVIRONMENTSThe model “QVSB” separated combustion unit heater isdesigned to be installed in mildly hostile environments where dusty, dirty, and mildly corrosive conditions exist or high humidity or slightly negative pressures prevail. Theburners, pilot and flue system are enclosed within the unit. The entire combustion process is literally unaffected by theatmosphere in the space where the unit is located.

Standard Features:• CSA certified for 80% efficiencies• 10 sizes ranging from 100 to 400 MBH• Aluminized steel heat exchanger - 20 gauge• Optional 409 and 321 stainless steel heat exchangers• Single stage gas valve • Optional 2 stage and modulating gas valves• Spark ignition• Available in Natural or LP gas• Easy burner access with individual removable burners• Optional duct flange connection in lieu of discharge louvers


11

Indoor Duct FurnacesGAS-FIRED

Models QVED/QVESPOWER VENT DUCT FURNACESThe “QVED” and “QVES” are power vented indoor ductfurnaces. Model “QVED” offers bottom burner access and is typically ceiling suspended. The model “QVES” offers sideaccess and is typically mounted on a non-combustible floor.Both models offer high efficiencies that achieve annual fuelsavings of up to 25% over conventional natural vented unitheaters. Also featured is the factory installed power vent and sealed flue collector that controls combustion and excess air during on cycles.

Standard Features:• CSA certified for 80% efficiencies• 10 sizes ranging from 100-400 MBH• Aluminized steel heat exchanger - 20 gauge• Optional 409 and 321 stainless steel heat exchangers• Single stage gas valve • Optional 2 stage and modulating gas valves• Spark ignition• Available in Natural or LP gas• Easy burner access with individual removable burners


12

Indoor Duct FurnacesGAS-FIRED

Model QVSDSEPARATED COMBUSTION FORMILDLY HOSTILE ENVIRONMENTSThe model “QVSD” separated combustion indoor duct furnace is designed to be installed in mildly hostileenvironments where dusty, dirty, and mildly corrosiveconditions exist or high humidity or slightly negativepressures prevail.The burners, pilot and flue system areenclosed within the unit. The entire combustion process is literally unaffected by the atmosphere in the space where the unit is located.

Standard Features:• CSA certified for 80% efficiencies• 10 sizes ranging from 100-400 MBH• Aluminized steel heat exchanger - 20 gauge• Optional 409 and 321 stainless steel heat exchangers• Single stage gas valve • Optional 2 stage and modulating gas valves• Spark ignition• Available in Natural or LP gas• Easy burner access with individual removable burners


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Vent Pipe Sizes

Model

GG(Horiz Cat I)GG(Horiz Cat III)GG(Vertical)

TF/GF

QVEF, QVEB,QVED, QVES

GG(Horiz & Vert)

QVSF, QVSB,QVSD

Sizes

030-060075-120

030-120

030-120

150-250300-400100-175200-250300-400

030-075090-120100-175200-250300-400

Vent PipeDiameter

4”5”

4”

4”

5”6”4”5”6”

4”5”4”5”6”

STANDARD VENTING

SEPARATED COMBUSTION


14

Steam and Hot Water UNIT HEATERS

Model HSHEADER TYPE AND SERPENTINE TYPE MODELS ARE IDEAL FOR HOT WATER INSTALLATIONS Sterling model “HS” horizontal unit heaters are ideal for hotwater installations. A wide range of outputs and airflowsallows virtually unlimited flexibility in job design. Sterlingmodel “HS” horizontal unit heaters are available in bothserpentine and header type units. Serpentine units offeroutputs from 8,030 to 35,900 BTU’s and are ideal for hotwater installations with limited clearances. Header typehorizontal units range from 18,000 to 360,000 and canoperate with either hot water or steam. Both units arefurnished with totally enclosed motors as standard equipment, explosion proof motors are optional.

Standard Features:• Horizontal louvers standard• Vertical louvers optional• Thermostats feature ‘off-auto’ and ‘auto-fan-off’• Copper/aluminum coils• ETL certified• Strap-on water control optional• Steam pressure control optional


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Model VSVERTICAL UNIT HEATERSterling model “VS” vertical unit heaters aredesigned for installations requiring down flow airdelivery. Offered in 15 sizes ranging from 41,300 to 705,000 BTU units are field convertible to lowoutput (increased airflow) for high ceilingapplications. All units are compatible with Steam or Hot Water operation.

Standard Features:• Copper/aluminum coils• Totally enclosed motor• Thermostats feature ‘off-auto’ and ‘auto-fan-off’• Strap-on water control optional• Steam pressure control optional• OSHA fan guard optional• Explosion-proof motors optional


AlsoAvailablefromSterling:

• Cabinet Blowers• Oil-Fired Unit Heaters• Low Intensity Infrared Heaters• High Intensity Infrared Heaters• Outdoor Duct Furnaces• Evaporative Coolers• Air Handlers• Gas-Fired Make-Up Air Systems

HVAC PRODUCTS260 North Elm Street, Westfield, MA 01085Tel. 413-564-5540, Fax: 413-562-5311www.sterlinghvac.com

SUH-3

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